Liquid crystal display panel and liquid crystal display device

Abstract

In a display panel of an active matrix-type liquid crystal display device in an In-Plane Switching mode, a black matrix is formed on the surface of a transparent substrate of a color-filter substrate, the surface being at a side opposed to a TFT substrate. The black matrix is made of a laminated film for which a metal oxide film and a metal film have been alternately laminated in two layers or more. The black matrix has a thickness of 0.2 μm or less and an OD value of 3 or more. Moreover, an electric-field shielding layer made of an ITO film connected to a common electrode is provided on a data line formed on the TFT substrate, via an insulating film. Furthermore, an impurity is doped in a liquid crystal layer so that resistance thereof becomes 1×10 11 through 1×10 13 Ω·cm.

1 . A liquid crystal display panel comprising: 
 first and second substrates arranged so as to be opposed;    a liquid crystal layer filled between the first and second substrates;    a pixel circuit provided on a surface, of the first substrate, at a side of the liquid crystal layer, for applying a voltage to the liquid crystal layer;    a black matrix provided on a surface, of the second substrate, at a side of the liquid crystal layer, made of a laminated film for which a metal oxide film and a metal film have been alternately laminated in two layers or more, having a thickness of 0.2 μm or less and an optical density (OD value) of 3 or more;    a color filter provided on a surface, of the second substrate, at a side of the liquid crystal layer;    an overcoat layer provided in a manner covering the black matrix and color filter; and    a granular or columnar spacer provided on the overcoat layer on the black matrix, for holding a fixed gap between the first and second substrates,    wherein said liquid crystal display panel is mounted on an In-Plane Switching mode liquid crystal display device.    
   
   
       2 . The liquid crystal display panel as set forth in  claim 1 , wherein 
 for the black matrix, the metal oxide film has been arranged at a side furthest from the liquid crystal layer.    
   
   
       3 . The liquid crystal display panel as set forth in  claim 2 , wherein 
 for the black matrix, the metal oxide film has been arranged at a side closest to the liquid crystal layer.    
   
   
       4 . The liquid crystal display panel as set forth in  claim 1 , wherein 
 the metal oxide film is a chromium oxide film, and the metal film is a chromium film.    
   
   
       5 . The liquid crystal display panel as set forth in  claim 1 , wherein 
 the fixing-type spacer is a columnar spacer formed of a photosensitive resin.    
   
   
       6 . The liquid crystal display panel as set forth in  claim 1 , further comprising 
 an electric-field shielding layer formed, via an insulating film, on a part of the pixel circuit, said part being at least a part of an area opposed to the black matrix.    
   
   
       7 . The liquid crystal display panel as set forth in  claim 6 , wherein 
 said pixel circuit has a data line and a scanning line extending in mutually orthogonal directions, and the electric-field shielding layer has been formed in a manner covering at least either the data line or the scanning line.    
   
   
       8 . The liquid crystal display panel as set forth in  claim 6 , wherein 
 said pixel circuit has a common electrode, and the electric-field shielding layer has been connected to the common electrode or a ground.    
   
   
       9 . The liquid crystal display panel as set forth in  claim 7 , wherein 
 said pixel circuit has a data line and a scanning line extending in mutually orthogonal directions, and the electric-field shielding layer has been formed in a manner covering at least either the data line or scanning line.    
   
   
       10 . The liquid crystal display panel as set forth in  claim 6 , wherein 
 said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.    
   
   
       11 . The liquid crystal display panel as set forth in  claim 7 , wherein 
 said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.    
   
   
       12 . The liquid crystal display panel as set forth in  claim 8 , wherein 
 said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.    
   
   
       13 . The liquid crystal display panel as set forth in  claim 9 , wherein 
 said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.    
   
   
       14 . The liquid crystal display panel as set forth in  claim 7 , wherein 
 in the liquid crystal layer, an impurity is doped so that resistance becomes 1×10 11  through 1×10 13 Ω·cm.    
   
   
       15 . The liquid crystal display panel as set forth in  claim 1 , wherein 
 the black matrix has an optical density of 4 or more.    
   
   
       16 . A liquid crystal display device comprising the liquid crystal display panel as set forth in  claim 1.